At about seven o'clock on the morning of September 13th the enemy's fleet was observed to be in motion off the Orange Grove, and shortly afterward the ten floating batteries were under way, and with a crowd of boats standing for the southward with a light northwest breeze.
Shortly after ten o'clock they had reached their respective stations off the line-wall, and Admiral Don Buenoventura Moreno, in the Pastora, having taken up a position opposite the capital of the King's Bastion, the others anchored in admirable order on his right and left flanks, at about one thousand yards distance from the walls of the fortress.
At this time the enemy's camp and the surrounding hills were covered with countless thousands of spectators, who had hurried from all parts of Spain to witness the fall of Gibraltar. The batteries had no sooner let go their anchors than a tremendous cannonade of hot and cold shot was opened upon them all along the line; at the same instant the ponderous vessels replied from all their guns, supported by the fire of one hundred eighty-six pieces of ordnance from the works on the isthmus.
Never before in the annals of war had a spectacle so magnificently grand been witnessed—four hundred cannon belched forth their volleys of fire at the same moment, the whole heaven was obscured by the curling clouds of smoke which clung around the rugged peaks of the rocks, while the misty gloom was fitfully illumined by the flashes of a thousand saucisses and shells. The whole peninsula was overwhelmed with a torrent of shot.
For two hours this terrible cannonade continued without intermission, and no impression had been made upon the floating batteries; so well calculated was their construction to withstand the effects of artillery that the heaviest shells rebounded from their roofs and the shot struck harmless on their sides. Upward of two thousand red-hot balls had been thrown against them, and no symptoms of combustion appeared, except here and there a feeble flame, which ere it could spread was quenched.
At noon the enemy slackened their fire from the sea for a moment, but seemingly only for the purpose of amending the direction of their guns, which had previously been uncertain and too high; the pause was but for an instant, and the artillery again burst forth with a more powerful and better-directed fire. Showers of every missile swept over the walls, and already the British troops, disappointed with the effects of the red-hot shot, and fatigued with the mid-day sun, began to look gloomily upon the issue of the fight. But about two o'clock slight wreaths of flame were observed issuing from the Admiral's ship, and at the same time a strange confusion was remarked among the men on board the Talla Piedra. On board this battery was the Chevalier d'Arçon, who was present in the action as a volunteer to watch the success of his own inventions. Several red-hot shot had struck this ship, but one alone gave any uneasiness to those on board; to reach the smouldering woodwork the guns were silenced, and the smoke clearing away left the vessel exposed to such a concentrated fire that all efforts to arrest the progress of the flames were in vain. The blaze rapidly spread, the crew were seized with a panic, and, fearful of an explosion, turned the water into the powder-magazines. Thus one battery was rendered useless during the remainder of the action.
In the Admiral's ship the flames were for some hours subdued, and her guns continued to play upon the walls until nightfall; but the disorder which was immediately visible in the Talla Piedra and the Pastora soon affected the whole line of attack, and by 7 p.m. the fire from the fortress had gained a commanding superiority.
At midnight signals of distress were made from all parts of the bay. The Admiral's ship was in flames from stem to stern, and others had been set on fire. The enemy now determined to abandon all the ships, and those which had hitherto resisted the effects of the red-hot shots were, by order of the Admiral, set in flames.
As the gray morning dawned, the scene on the waters of the bay was sublimely terrible; masses of shattered wreck, to which were clinging the drowning crews, floated over the troubled waves; groans and cries for help reached even to the walls, or were drowned in the thunders of the exploding magazines, while the glaring flames of the burning vessels cast a lurid light over the awful spectacle.
At two o'clock in the morning Brigadier Curtis, who with his squadron of gunboats lay at the New Mole ready to take advantage of any opportunity to harass the enemy, pushed out to the westward and with great expedition formed line upon the flank of the battering-ships. This sudden movement completely disconcerted the Spaniards, who were engaged in removing the crews from the vessels, and they fled precipitately, abandoning the wounded and leaving them to perish in the flames. As daylight appeared two feluccas, which had not been able before to escape, were discovered endeavoring to get away, but, a shot from one of the gunboats killing five of their men, they both surrendered.